Cooling apparatus for transformers



July 8, 1924. 1,500,764

L. G. MCCLINTOCK 000mm APPARATUS FOR TRANSFORMERS,

Filed Sent. 1, 1922 INVENTOR 46341;. j M

ATTORNEYS,

' ments in Cooling Patented July 8 1924.

UNITED STATES A 1,500,154 PATENT OFFICE. I

LEWIs GLKOCLINTOCK, 0F PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO PITTSBURGH TRANSFORMER COMPANY, A CORPORATION OF PENNSYLVANIA.

COOLING APPARATUS FOR TRANSFORMERS.

Application filed September 1, 1922. Seriai No. 585,596.

To all whom it may concern:

Be it known that I, LEWIS G. MOCLIN- TOOK, a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improve- Apparatus for Transformers, 6f whic the following is a specification.

This invention relates to electrical transl formers and particularly to cooling means for the oil of a tank in which the transformer is submerged. The chief object of the invention is to provide cooling apparatus which will maintain the circulating oil in the form of a thin downwardly fiowing layer or sheet and which at the same time will increase the eliiciency of a cooling action by giving the said sheet a compact, folded or corrugated form in vertical arallel strips arranged at angles to each 01: er.

Other objects of the mvention, particularly in providing a cooling apparatus combining strength and simplicity of SlIIUC ture, will appear from the following description taken in connection with the accompanying drawings in which i Fig. 1 is a vertical elevational view of a transformer tank provided with cooling apparatus illustrating the invention.

Fig. 2 is a vertical sectional view of a i portion of Fig. 1.

.Fig. 3 is a diagrammatic plan view of ap aratus shown in Fig. 1.

4 is a detached perspective view of one of the coolers.

- F 5 is a plan view of the same.

. Fig. 6 is a detailed sectional view of the structure shown in Figs. 4 and 5. I

-In the specific apparatus shown in the drawings illustrating. one embodiment of the invention a tank K containing a transformer Timmersed in oil to a level L is connected by upper and lower pipe connections 9 and 10 with cooling apparatus comprising usually a series of separate coolers C (Fig. 3). Each cooler C comprises an outside wall 11 and an inside wall 12 spaced apart 'a'relatively small distance D so that the circulating oil flowing down between them is in the form of a thin sheet moving downwardly at all portions and without any dead portions or countercurrents. To give as full and rapid a circulation as possible through the cooler C the pipe connections 9 and 10 are very large in cross section area and are preferably, for instance, of a combined area equal approximately to the cross section area of the passage through the cooler C.

In order to provide a compact efi'icient form to the cooler G its inner and outer sides of walls 11, 12 are folded or corrugated while at the same time retaining'the general parallel relation between these walls. Each cooler is thus shaped to form. a series of vertical strips a, Z), c, d, e, f, etc., at an angle to each other and in zigzag form while still preserving the unity and continuity of the sheet of circulating oil. By this formation the overall horizontal dimensions of the cooler are reduced while still maintaining the full extent of the cooling area, thus permitting a larger number of coolers to be placed within a given space. The sup ly and return pipes 9 and 10 are connected to the inner wall 12 at the top and bottom and are preferably arranged So as to partially straddle the ridge formed by the portions 0. d, the apex of the angle between these portions being located at about the center of the pipe connections and the ends of the pipes being bifurcated so as to extend aldng the surfaces 0. (Z, of the plate or wall 12 to be welded thereto as, indicated The passage between the walls 11, 12 at the areas at connections to pipes 9, 10 thus extends inthe same general direction of said pipes to smoothly receive, distribute and return the oil. A t the same time the extended connections lfi, 16 of the pipes 9, 10 with the cooler C give a strong joint adapted to safely sustain the weight of the cooler and its contained body of oil.

Inthe formation of the cooler C shown in the drawings (he sheets or plates ll, 12 are similarly folded or corrugated so as to be substantially parallel to each other and rods 20, 21 similarly bent or corrugated along zigzag lines to fit hetweeu side plates or walls. 11. 12 at their ends as shown in Fig. 2. Welds are then formed between the rods and the adjacent edges of the pipe to close and rigidly support the ends of the cooler (l. The vertical side edges are prefcrably closed over and welded as shown in Fig. 2 in which the outer plate 11 has its end 22 bent over at :23 to form a groove in which the welding metal 24 is deposited.

The cooler of this invention is thus simple and inexpensive in formation strong and durable. The longitudinal folds or corrugations greatly increase its strength and rigidity by the succession of connected arches thus formed. At the same time the volume of oil in. the cooleris relatively small due to the close spacing of the walls 11 and 12, thus further saving in the first cost of the oil required to fili the tank and coolers.

In lieu of Welding the parts together they may be fastened by brazing or in any other suitable manner,

I claim: v

1. Cooling apparatus comprising a cooler adapted to be spaced from a tank and connected thereto said cooler comprising two complementary corrugated sheets spaced apart at the top and bottom by spacing rods and Welded thereto, and the side edges of one plate being bent over and Welded to the other plate.

2. An apparatus comprising a tank, a cooler spaced from said tank, comprising two complementary corrugated sheets spaced apart to form a thin corrugated space and pipe connections joining the interior of said tank and said space, said pipe connections having passages Whose combined area is at least substantially equal to the area of said space transverse to said corrugations.

3. An apparatus comprising a tank, a

neocaea cooler spaced from said tank comprising two complementary corrugated sheets spaced apart to form a thin corrugated space and pipe connections joining the interior of said tank and space having passages which. are directed normal to said cooler, and which communicate with said space at an inner bend or" a corrugation, whereby fluid leaving l ,,or entering the said passages is guided without sudden change in direction, transversely of said corrugation.

4. An apparatus comprising a tank, a cooler spaced from said tank comprising two complementary corrugated sheets spaced apart to form a thin corrugated space, pipe connections joining the interior of said tank and said space, said pipe connections having passages communicating with said space at an inner bend of a corrugation and having a combined area at least substantially equal to the area of said space transverse to said corrugations.

5. An apparatus comprising atank having a curved Wall, coolers spaced at in.- tervals from said vvall, each cooler formed to foliow thecurvature of said Wall and comprising two complementary corrugated sheets Welded together at their edges and spaced apart between their edges to form a narrow corrugated space.

LEWIS G. McQLHITOGK. 

